feat(frontends/lean/decl_cmds): save ident infos after `attribute` cmd
feat(frontends/lean/decl_cmds): save ident infos after `attribute` cmd

leanprover/lean,Kha/lean,digama0/lean,fpvandoorn/lean,leanprover/lean,Kha/lean,leodemoura/lean,leanprover/lean,digama0/lean,leanprover-community/lean,digama0/lean,leodemoura/lean,leodemoura/lean,digama0/lean,Kha/lean,digama0/lean,Kha/lean,fpvandoorn/lean,leanprover-community/lean,dselsam/lean,dselsam/lean,leanprover-community/lean,leodemoura/lean,Kha/lean,leanprover-community/lean,leanprover/lean,fpvandoorn/lean,dselsam/lean,dselsam/lean,leanprover/lean,fpvandoorn/lean,dselsam/lean,leanprover/lean,fpvandoorn/lean,leodemoura/lean,digama0/lean,fpvandoorn/lean,leodemoura/lean,leanprover-community/lean,Kha/lean,leanprover-community/lean,dselsam/lean